Albert Levi and M. Ufuk Caglayan, "Integrity Control In Nested Certificates",  in the proceedings of BAS'99, The Fourth Symposium on Computer Networks, 20-21 May 1999, Istanbul, Türkiye, pp. 149 –157.

Abstract - Nested certificates are proposed as certificates for other, subject, certificates. However, any malicious modification over the subject certificate cannot be located by the verification of it via a nested certificate. This integrity control problem can be solved by employing one way hash functions. In this paper, two integrity control methods for the subject certificate verification are described. Their relative advantages and disadvantages are also discussed.

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